‘ 
[ 10 J 
* Thie three mineral acids-them- 
felves” may poflibly be but one, 
_and the fame acid modified by fome 
»patticular addition, which time may 
-difcover, to feparate and thus to 
change marine acid into nitrous acid, 
&c. Some eminent chymifts have 
already allerted this as their. opie 
~ nion.” es, 
et en may, Taake 
Sane: one quite “different in nature 
. from the other. Common air im- 
pregnated with phlogifton makes a 
poilonous ‘air ;. aud common - alr, 
deprived of it, makes dephlogifti- 
cated air; in the one an animal 
dies in a little time 3. ine the other 
* 
it lives four or five times longer 
than in common air. Vitriolic acid © 
extracts from. iron its phlogitton, 
and allows it to impregnate the air 
difengaged in the aét of folution. 
Nitrous 
~ 
Sa 
